What causes high BUN and low APTT?

High BUN and low APTT can be caused by many reasons.

If your BUN is in between 6 mg/dL and 20 mg/dL and your APTT is in between 22 seconds and 35 seconds then you need not worry as these are the normal ranges for BUN and APTT respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Normal range of BUN : 6 - 20 mg/dL

Ideal values of BUN depending on age :

Age	Ideal BUN value
<5 years	6.064
5-10 years	6.128
10-15 years	6.193
15-20 years	6.259
20-25 years	6.325
25-30 years	6.392
30-35 years	6.46
35-40 years	6.528
40-45 years	6.597
45-50 years	6.667
50-55 years	6.738
55-60 years	6.809
60-70 years	6.881
70-80 years	6.954
80-90 years	7.028
90-100 years	7.102
>100 years	7.177

*Ideal values are calculated based on our database of patient records

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Normal range of APTT : 22 - 35 seconds

Ideal values of APTT depending on age :

Age	Ideal APTT value
<5 years	22.233
5-10 years	22.469
10-15 years	22.707
15-20 years	22.948
20-25 years	23.191
25-30 years	23.437
30-35 years	23.685
35-40 years	23.936
40-45 years	24.19
45-50 years	24.446
50-55 years	24.705
55-60 years	24.967
60-70 years	25.232
70-80 years	25.499
80-90 years	25.769
90-100 years	26.042
>100 years	26.318

High BUN and low APTT can be caused by a lot of reasons. If you take BUN and APTT blood tests and the results are higher than 20 mg/dL for BUN and lower than 22 seconds for APTT, your physician may recommend more tests to figure out the problem. You might also get these tests if your physician thinks you have some other disease.

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How the BUN and APTT Tests Are Done :

If your doctor wants BUN and APTT tests on you, you may need to go through these tests. During the BUN and APTT blood tests, a pathologist will put a needle into your veins and take out a small quantity of blood. A pathologist is a physician in the medical field who thoroughly studies the causes and effects of disease. Within a few hours you will get your BUN and APTT Test reports by your pathologist.

Medical References

• Mayo Clinic – Blood urea nitrogen (BUN) test
• MedlinePlus – BUN (Blood Urea Nitrogen)
• Cleveland Clinic – Blood Urea Nitrogen (BUN): Testing, Levels & Indication